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Many people have argued that natural categories are organized in terms of a family resemblance principle. Members of family resemblance categories tend to share properties with each other but have no properties that are singly necessary and jointly sufficient (defining) for category membership. This paper reports seven experiments using a sorting task to evaluate the conditions under which people prefer to construct categories according to a family resemblance principle. The first set of studies followed the typical practice of defining family resemblance in terms of independent sets of matching and mismatching values. Across a variety of stimulus materials, instructions, procedures, and category structures, family resemblance sorting was almost never observed. Despite procedures designed to prevent it, participants persisted in sorting on the basis of a single dimension. The second set of studies explored the …